The info I have from Meridian is that it will also be able to connect to the MMHR input and pass through multichannel audio. At least bitstream. Whether or not it will accept multichannel PCM from the HDMI input I do not know.

Cinema: G65, UHD722, 210, DSP520.2, DSP320.2, DSW.2,
Music room: 551, 563, MS200, Michell Gyro SE
Lounge: Focal 1000IWLCR Utopia